Crane

Abstract

This crane comprises a traveling vehicle body that travels through use of a motor driven by a power supply unit, and a first cooling system for cooling the motor, the first cooling system having a plurality of cooling devices that are distributed in the traveling vehicle body and connected in parallel with each other, and that cool a fluid that flows through a circuit of the first cooling system.

1 . A crane comprising:
 a traveling vehicle body that travels with a motor driven by a power supply unit; and   a first cooling system that cools a lower electric device, wherein   the first cooling system includes a plurality of cooling devices dispersedly arranged on the traveling vehicle body, connected in parallel to each other, and configured to cool a fluid flowing through a circuit of the first cooling system.   
     
     
         2 . The crane according to  claim 1 , wherein the fluid branches on an upstream side of the plurality of cooling devices, flows into the plurality of cooling devices, is cooled, and then joins and circulates. 
     
     
         3 . The crane according to  claim 1 , wherein each of the plurality of cooling devices is disposed to face obliquely upward to guide air in the cooling device upward. 
     
     
         4 . The crane according to  claim 3 , wherein the first cooling system further includes an air vent tank provided above the plurality of cooling devices and connected to the plurality of cooling devices. 
     
     
         5 . The crane according to  claim 1 , wherein
 the plurality of cooling devices includes a right-side cooling device and a left-side cooling device,   the right-side cooling device discharges air sucked up from below to obliquely upward to right, and   the left-side cooling device discharges air sucked up from below to obliquely upward to left.   
     
     
         6 . The crane according to  claim 1 , further comprising a second cooling system that is a cooling system independent of the first cooling system and cools the power supply unit, wherein
 the plurality of cooling devices is dispersedly arranged on left and right sides of the power supply unit, and   the second cooling system is disposed above the power supply unit.   
     
     
         7 . The crane according to  claim 1 , wherein the plurality of cooling devices is arranged in a line in a left-right direction at a rear end of the traveling vehicle body. 
     
     
         8 . The crane according to  claim 1 , wherein
 the first cooling system includes a first cooling circuit and a second cooling circuit provided in parallel, and   the first cooling circuit and the second cooling circuit cool the lower electric devices different from each other.   
     
     
         9 . The crane according to  claim 8 , wherein
 the first cooling circuit is a circuit for cooling the lower electric device related to traveling of the crane, and   the second cooling circuit is a circuit for cooling the lower electric device related to an operation of the crane.